Question

Probability and Statistics

Could you please solve the following questions with specifying the answers

A. When finding confidence intervals, the interval is smaller if

a.sample size and standard deviation are bigger

b.sample size and standard deviation are smaller

c.sample size is bigger, but the standard deviation is smaller

d.sample size is smaller, but standard deviation is bigger.    

B. If the birth weights of the babies born annually in a hospital is Normal with a mean of 5 pounds 10 ounces and a standard deviation of 5 ounces, what percentage of babies are born weighing less than 5 pounds? (No table needed.)

a. 13.5%       b. 2.5%       c. 16%        d. .3%

C. What percent of the babies born weigh between 5 pounds and 5 pound 5 ounces? (Again no table.)

a. 13.5%       b. 47.5%       c. 16%        d. 34%

D. Of the 40 babies born during the first weeks of next month, how many are likely to be under five pounds?

a. 4      b. 2      c. 6     d. 1     

Answer 1